<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <style type="text/css">
        html,body{
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
        }
    </style>
</head>
<body>
    <div style="display: -webkit-flex; -webkit-align-items: center; -webkit-justify-content: center;height: 100%; ">
        <img src="../../style/img/contentload.gif" style="width:20px;height:20px;">
    </div>
</body>
</html>